The T34 Heavy Tank was an American design for a heavy tank. It was evolved from the T29 Heavy Tank and T30 Heavy Tank in 1945, sporting a 120 mm (4.72 in) modified anti-aircraft gun. Extra armor plating was applied to the rear of the turret bustle as a counterweight for the heavier 120mm T53^[3][4] main gun. The vehicle was deemed too heavy and no production orders were placed.^[5]